To achieve adaptability to low frequency， wide bandwidth， high amplitude， and other vibration environments， a piezoelectric vibration harvester with excitation direction conversion （PVHEDC） is proposed； it constitutes a vibration collector and transducer. Due to the commutation structure， the vibration direction of the transducer is perpendicular to the ambient vibration direction， limiting the response amplitude. The dynamic model of the PVHEDC was established， and the influence of relevant parameters on its output characteristics was obtained via simulation and experiments. As a result， two natural frequencies were observed considering a low-frequency environment， which are the natural frequencies of the vibration collector and transducer， respectively， causing the output voltage of the PVHEDC to peak. With increasing length and proof mass of the elastic beam， fn1 gradually decreased， while f_n2 remained unchanged， with the former corresponding to an essentially unchanged output voltage and the latter corresponding to an increased output voltage. Meanwhile， the bandwidth broadened. The experiment results show that when the external excitation amplitude increases to a certain value， the output voltage no longer increases， and the amplitude of the PVHEDC is effectively controlled. The achieved maximum output power is 0.4 mW for the optimal external load resistance of 540 kΩ. In practice， the above parameters influence the resonant frequency of the PVHEDC and its corresponding output voltage and limit the response amplitude， allowing adaptation to low-frequency， broadband， high-intensity， and large-amplitude working environments.